- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.487 inches nominal
- Fastener Length
- 1.047 inches minimum and 1.067 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.360 inches minimum and 0.399 inches maximum
- Internal Drive Style
- Hexagon
- End Item Identification
- Not known
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.156 inches nominal
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 100.0 degrees nominal
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Special Features
- Double lead thd; airworthy certificated item supplied with certificate of conformity documentation
- Material
- Steel comp 4140 or steel comp 8740 overall
- Material Document and Classification
- MIL-S-5626 mil spec 1ST material response or MIL-S-6049 mil spec 2ND material response overall
- Surface Treatment
- Cadmium overall
- Surface Treatment Document and Classification
- QQ-P-416 ty 2 cl 2 fed spec single treatment response overall
- Thread Series Designator
- UNF
Catalogue data is compiled from public DLA/FLIS sources and is provided for
identification. Availability, condition and certification are confirmed on
quotation. OmniSynk Distribution Services is a stocking distributor.